That looks like an awesome unit!
I bet the inverter draw on the fan would be pretty small, given the units size. I truly hate the loud fan on our OEM RV furnace, that’s one thing I love about the Buddy heater, nice radiant heat and no sound.
I see they sell them in Canada as well – http://www.rinnai.ca/vent-free
I See they have them on Amazon for a little over $500
RVHH Chief Cook and Bottle Washer - LoveYourRV.com